are there two different trans in zr-1's

[zr-1assassin]

guys, i just had a gm mechanic (there corvette guy) mechanic tell me there were two different transmissions put in the zr-1! i of-course told him he was crazy. am i wrong??? one was a t-10 and the other was a t-6 or something??? he said some where 6-speeds and the others were 5 speeds with overdrive! help me out on this if you have heard about this please

[DaveK]

I've only heard of one but I'm not a corvette historian. The T10 was the old 4speed in the pre-C4s I think and also formed the non-overdrive part of the Doug Nash 4+3 in the early C4s. No idea what a T6 is.

Sounds like their 'corvette guy' needs to go back to school

[Corvettes White]

Yes and no.

One family of ZF 6 speeds but two styles of gears inside, if I recall corectily.

George

[IowaZR-1]

The part # was changed on the ZR-1 transmission from 10186865 to 10255122 starting on VIN #800232 in the 1993 model year. All Zr-1's are 6-speeds and 5th and 6th are overdrives.

[blackjack]

there are two types of zf-6,apparently...the early ones(90-93) can handle more torque,as the late ones have different teeth angle to make them quieter,but a little less beefy
bj 91/1735

[Aurora40]

Originally Posted by zr-1assassin

he said some where 6-speeds and the others were 5 speeds with overdrive!

No, that never happened. There were earlier Corvettes that had a 4-speed with a 2-speed overdrive, but not by the time the ZR-1 was on the scene.

[zr-1assassin]

thats what i was thinking!!!!!!! AURORA. this is all over me having the clutch replaced. he asked me wich trans i had and i was dumbfounded. for some reason i never have had much luck with the GM techs. and to top it all off he said just to put it in (i already purchased the clutch kit) would be $1240.00-JUST TO PUT IT IN! does someone know what this SHOULD cost to have the clutch installed. no flywheel-just ACDELCO clutch kit i have? thanks guys

[tomtom72]

I live in the NYC/Metro area & that's the price I was quoted to do the labor, more or less. The dealer that quoted me was below a $100 @ hr on the labor. If I remember right the total job, parts + labor was right at $1400 with the sales tax.


Tom

On the trans issue, I think the early Z's had black tag (made in Germany) and the later Z's were blue tag (made in USA). The gears in 1 thru 4 on the blue tag ones had different cut angle for less whine. I also believe the inputshaft collar has a different diameter so the T/O is different P/N on the blue tag trans but that may not apply to the Z, just the other 6spd C4's.

[guinnessdood]

Originally Posted by zr-1assassin

guys, i just had a gm mechanic (there corvette guy) mechanic tell me there were two different transmissions put in the zr-1! i of-course told him he was crazy. am i wrong??? one was a t-10 and the other was a t-6 or something??? he said some where 6-speeds and the others were 5 speeds with overdrive! help me out on this if you have heard about this please

This probably will help...I think it answers everything...they are ALL ZF 6 speeds, but there are two versions and the two ZR-1 versions have different input shafts/guide tubes than the other C4 units.


QUESTION: Are the 6-speed transmissions in the ZR-1 the same as in other 6-speed C4s?
ANS: No, the unit in ZR-1s is specific to the car and unlike those used behind L98s, LT1s or LT4s. The difference is longer input shaft (~$550) and longer guide tube (~$110). This conversion requires unit disassembly (~4 hours labor). Also there are two different units (torque rating) used in the ZR-1: 1990-93 1/2 and 1993 1/25-95.

[TommyL]

The early ZFs have a black label attached and later ones have a blue label attached.